各位巨佬，请问这错在哪里？
import math
def quadratic_equation(a, b, c):
answer = b * b - 4 * a * c
x1 = (-b + math.sqrt(answer)) / 2 * a
x2 = (-b - math.sqrt(answer)) / 2 * a
return x1, x2
print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)
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